Initial Corrosion Behavior of Q235 Steel under Natural Exposure andAccelerated Conditions in Haikou Atmospheric Environment
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摘要: 在海口大气环境下对Q235钢进行为期180 d的自然暴露试验和喷洒质量分数3.1%NaCl溶液的加速自然暴露试验,通过腐蚀形貌、腐蚀深度以及腐蚀后拉伸性能的对比,研究了加速条件对该钢初期腐蚀行为的影响。结果表明:试验钢朝天面比朝地面的腐蚀速率更大,喷洒NaCl溶液对腐蚀的加速效应显著;随试验时间的延长,锈层对基体的保护作用增强,试验钢的腐蚀速率减小,加速自然暴露工况下生成的锈层保护作用更强;2种工况下试验钢的拉伸性能均随腐蚀质量损失率的增大而降低,自然暴露和加速自然暴露工况下降低程度最大的分别为弹性模量和断后伸长率;自然暴露工况腐蚀对拉伸性能的削弱效果高于加速自然暴露工况下,其中对弹性模量削弱效果的差异高达14倍。Abstract: Natural exposure tests and accelerated natural exposure tests by spraying 3.1wt% NaCl solution were carried out on Q235 steel in Haikou atmospheric environment for 180 d. The effect of acceleration conditions on the initial corrosion behavior of the steel was studied by comparing the corrosion morphology, corrosion depth and tensile properties after corrosion. The results show that the corrosion rate of the test steel facing upward the ground was higher than facing toward the ground. Spraying NaCl solution had a significant acceleration effect on corrosion. With the extension of time, the corrosion rate of the test steel decreased due to the improvement of the protective effect of the rust layer on the matrix, and the protective effect of the rust layer formed under the accelerated natural exposure condition was stronger. The tensile properties of the test steel under both conditions decreased with the increase of corrosion mass loss rate, and under natural exposure and accelerated natural exposure conditions, the elastic modulus and percentage elongation after fracture were the most reduced, respectively. The weakening effect of corrosion on the tensile properties under natural exposure condition was higher than that under accelerated natural exposure condition, and the difference of weakening effect on elastic modulus was up to 14 times.
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Keywords:
- Q235 steel /
- exposure test /
- acceleration effect /
- corrosion morphology /
- corrosion mass-loss /
- tensile property
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